Electric signal



n IIIIII E. W. HAZAZER.

ELECTRIC SIGNAL.

APPLICATION FILED JULY 14, I9I6- Patented Nov. 22, 1921.

.IIIIIIIIII I I IIllIiIiIiIi Q ZO J 4 IIIIIIIIIIIII UNITED'STATES PATENT OFFICE.

EDGAR W, HAZAZER, OF NEW YORK, N. Y.

ELECTRIC SIGNAL.

Specification of Letters Patent.

Patented N ov. 22, 1921 Application filed July 14, 1916. Serial No. 109,241,

useful Improvements in Electric Signals, I

fully described and'represented in the following specification and the accompanying drawings, forming a part of the same.

This invention relates to certain improvements in signals of that class embodying a diaphragm which is vibrated by electric current. While the invention may be used and is intended for use with direct current circuits in which the current is interrupted by suitable interrupting devices, it has been especially designed for use in electric circuits wherethe current is alternating and the invention will be described as used in such circuit. V

Alternating current electric systems as now generally designed deliver power to the consumer with a current having about 120 impulses, that is, flow from maximum to zero, per second. While such current, when used to actuatea diaphragm, will produce'a sound, the vibrations are not sufliciently rapid to produce the desired pitch when the sound is produced for the purpose of giving an alarm, as, for'instance, a fire alarm, in factories or other buildings, or for signaling purposes generally, and this particularly when diaphragms of relatively small size are used.

It is the object of the present invention to produce an improved construction to improve the quality and pitch of the sound produced by a vibrating diaphragm of convenient size, vibrated by the usual alternating current supplied from power houses, by causing the diaphragm to be vibrated between the current impulses, thus increasing the'number of vibrations per second of the diaphragm.

It is a further object of the inventionto provide such a construction which shall be simple, cheap to construct, and of convenient form and size for use where desired.

Fora full understanding of the invention a detailed description of a construction embodying the same will be given in connection with the accompanying drawings, in which- Figure 1 is a plan view of the improved device;

Fig. 2 is a'vertical sectional View of the construction shownin Fig. 1, taken-0n line 2-2 of that figure, and showing the device secured to a convenient support;

Fig. 3 is a sectional view'taken on the line 3-3 of Fig. 2, and y I y Fig. 4 is a diagrammatic showing of an electric circuit employed for actuating the signal. I

Referring now to these drawings, the device includes a diaphragm 1 which, as usual, is in the form of a thin metallic plate or disk heldbetween the front and back sections 2, 3

of the diaphragm case, the diaphragm being clampedbetw'een the sections as is usual by clamping screws 4: passing through the margins of the sections 2, 3 of the case and the marginal part of thediaphragm.

This diaphragm is vibrated from a suitable source of alternating current receiving a vibration for each current impulse. In accordance with'the invention, this diaphragm will also be vibrated between each current impulse so that-the vibrationsof the' diaphragm will be doubled and thus produce a sound having a pitch higher than would be produced were the diaphragm vibrated by the'alternating current'impulses only." The various connections for efiecting this may, of course, be varied. In the particular construction illustrated, however, the diaphragm is vibrated at each current impulse through a magnet 5 having a pole-piece 6 which, if desired, may as shown be madeof a number of laminae, the magnet being ina circuit a, b of an alternating current, this magnet actuating an armature 7 at each current impulse to cause the vibration of the diaphragm. The means employed for increasing the vibration of the diaphragm and causingit to vibrate betweencurrent impulses may be somewhat varied, but a convenient construction is that shown in which mechanical connections. As illustrated, the armature 7 is a rocking armature, being pivotally supported, as at 8, in frames 9, in which also is secured the magnet 5. This rocking armature 7 is provided at each side of its pivot. point with bearing faces 10, 11, and is rocked in one direction by the current impulse actuating the magnet 5, this impulse causing the bearing face 10 to vibrate the diaphragm at eachcurrent impulse. The armatureis rocked in the other direction between each current impulse to cause the bearing face 11 to vibrate the diaphragm at such time through suitable mechanical connections which, in the best constructions, will include a spring 12. This spring is preferably a flat spring having a slightly bent end '13 which contacts with the bearing facelO before referred to and against the tensionof whichspring-the armature is rocked bythe magnet during a current impulse. When the current impulse is at zero, and the magnet is consequently not energized, the spring 12 rocks the armature in the opposite directionand causes the bearing face 11 of the armature to vibrate the diaphragm during such current. lapse, thus doubling the vibrations of the diaphragm and producing a higherpitched sound. In

the best constructions, a second fiat spring 14 will be provided-which contacts with the bearing face 11, this spring assisting-the magnet in rocking the armature during the current impulse, though it will be understood that such spring 1a is not essential .to the operation of the device and :may be omitted if desired. Where springs such as 12, 14 are employed for rockingthe armature, they willbe secured. so that theirgtension may be adjusted. In the particular construction illustratechthey are secured by screws 15 at one of theirends' to the inner face of the diaphragm casing member 3, before referred to, and there are provided adjustable screws 16 passing through the outer face of the diaphragm casing member 3 by which the tension of the springs maybe regulated.

. .The rocking armature may be-of various configurations, but in the best constructions it i will preferably be as shown, that is,

.formed'with a recess having a beveled face 17 and, the pole-piece 6 will be'provided with a toe 18 adapted to enter this recess.

This construction affords a good attracting surface and effects an efiicient operation of the armature when the magnet is energized. If desired, the usual projector or. resonator 19 may be employed suitably secured to the outer face of the diaphragm casing member 2, before-referred to.

In the best constructions, to; afford Y a smoother and clearer note, a washer offelt or similar suitable material 21' is used between the armature. and the diaph agm. In the by the action of the first. spring.

best constructions, furthermore, to increase the vibratory quolities of the diaphragm,

there are provided means for slightly bowing in the diaphragm, as shown in Fig. 2. These means may be of any suitable character, but as shown consist of a flat spring 22 which acts to slightly bow in the diaphragm, abit of felt or other suitable material 23 being inserted between the spring and the diaphragm. r

The current maybe supplied to the device through any suitable connections, as a push button 20 suitably located in the circuit. 'While the invention has been shown and described;- in what is believed to be its most convenient and effective form, it will be understood that changes'and variations may be made in the particular form of the armature and inthe mechanical connections for rocking the armature between current impulses, and it is understood that "such changes and variations may be made without departing from the invention.

V'Vhat is claimed is: 1

1'. In a signal, the combination of a circuit, a magnet in the circuit, a rocking armature,'means for producing electric impulses in the -magnet, a. diaphragm, and spring means'aoting to hold the armature normally in a position in'which it exerts no pressure on thediaphragm but permitting a rocking movement past such normal positionin either direction. whereby 'the armature is springvagainst which the armature is rocked 1 In a signal,-the combinatlon of an alternating current'circuit, a magnet located in the circuit, the pole-piece of which is formed witha projection, a pivotedarmature with a recess in which'the projection of the polepiece is arrangedto project, a diaphragm vibrated by the, magnet on each current impulse, and mechanically operated means for causing the armature to vibrate the diaphragm betweencurrent impulses.

.4. In a-signal,.the combinationof an alternating current circuit, a magnet located in the circuit, a pole-piece which isformed with a projection, a pivoted armaturewith a recessin which the projection of the polepiece is arranged to project, a diaphragm vibrated by the magnet on each currentimpu s and a spr ng ag inst wh ch the ture is rocked by the current impulse for rocking the armature in the opposite direc tion.

5. In a signal, the combination of a cirsuit, a magnet in the circuit, means for producing impulses in the magnet of a predetermined frequency a diaphragm, a rocking armature positioned to bearing against the diaphragm substantially centrally thereof,

10 spring means acting to hold the armature normally in a position in which it exerts no pressure on the diaphragm but permits a movement past the normal position in either direction whereby the armature is caused to vibrate in time With the impulses and Vibrate the diaphragm at each current impulse and between'current impulses.

In testimony whereof, I have hereunto set my hand.

EDGAR W. HAZAZER. 

